Lesson 1: What Is JavaScript?

Introduction to JavaScript

JavaScript is a programming language that allows you to create interactive features such as:

• Responding to user actions (e.g., clicks, input).
• Updating webpage content dynamically.
• Validating form inputs.

Where to Write JavaScript

Inline JavaScript

<button onclick="alert('Hello, World!')">Click Me</button>

Internal JavaScript

Inside a <script> tag in your HTML file:

<script>
  alert('Hello from internal script!');
</script>

External JavaScript

Linking a separate .js file:

<script src="script.js"></script>

Example of script.js:

console.log('Hello from external script!');